A series of Fe substituted ZSM-48 nanocrystal aggregates were synthesized by the dynamic hydrothermal method. Through incorporation of Fe into ZSM-48 framework, the acidity of ZSM-48 zeolites has been modified. The hydroisomerization performances of n-dodecane were investigated on Pt supported ZSM-48 and Fe incorporated ZSM-48 zeolites. Fe incorporated ZSM-48 catalysts show higher n-C₁₂ hydroisomerization selectivity compared with parent sample due to weaker acid strength of Si–OH–Fe than Si–OH–Al. High temperature favor the generation of the multi-branched isomers (mainly dimethyl isomers) following the “Key-Lock” mode. Meanwhile, 5-methylundecane is the main product in the monomethyl isomers (MOB) and 2,6-dimethyldecane is the main product in the multi-branched isomers (MUB), which suggests the excellent shape selectivity of ZSM-48 and the “Key-Lock” mode is preferred on ZSM-48 catalysts regardless Fe substituted or not. The relationship between the mono-methyl isomers and the butene-TPD results has been correlated and investigated. Four desorption peaks corresponding to butene weakly adsorbed over Si–OH, Fe–OH or Lewis acid sites, the “Key-Lock” mode adsorbed butene, the “Pore-Mouth” mode adsorbed butene and the strongly adsorbed butene respectively, can be distinguished. ZLC results indicate that Fe modified ZSM-48 can effectively increase n-hexane diffusion rate and reduce the activation energy of diffusion of n-hexane, which is benefit for the hydroisomerization performance. S_MOB/S_MUB can be altered by Fe modification, however, the distribution of the mono-methyl isomers can hardly be affected.

采用动态水热法合成了一系列Fe取代的ZSM-48纳米晶聚集体。通过将Fe掺入ZSM-48骨架中，改变了ZSM-48沸石的酸性。在 Pt 负载的 ZSM-48 和 Fe 掺入的 ZSM-48 沸石上研究了正十二烷的加氢异构化性能Fe掺入的ZSM-48催化剂表现出更高的n-C₁₂由于 Si-OH-Fe 的酸强度比 Si-OH-Al 弱，因此与母体样品相比，加氢异构选择性较高。高温有利于“Key-Lock”模式下多支链异构体（主要是二甲基异构体）的生成。同时，5-甲基十一烷是单甲基异构体（MOB）中的主要产物，2,6-二甲基癸烷是多支链异构体（MUB）中的主要产物，这表明ZSM-48具有优异的形状选择性和“关键”无论 Fe 是否被取代，ZSM-48 催化剂上都优选“-Lock”模式。单甲基异构体与丁烯-TPD 结果之间的关系已被关联和研究。四个解吸峰对应于 Si-OH、Fe-OH 或路易斯酸位点上弱吸附的丁烯，“Key-Lock”模式吸附丁烯，可以分别区分“孔口”模式吸附丁烯和强吸附丁烯。ZLC结果表明Fe修饰的ZSM-48可以有效提高正己烷扩散速率降低，降低正己烷扩散活化能，有利于加氢异构化性能。Fe修饰可以改变S _MOB / S _MUB，但单甲基异构体的分布几乎不受影响。